Enhance: dark-mode in docs

docs/_includes/foot.html

@@ -2,3 +2,45 @@
 <script src="{{ '/assets/plugins/bootstrap/js/bootstrap.bundle.min.js' | prepend: site.baseurl }}"></script>
 <script src="{{ '/assets/plugins/overlayScrollbars/js/jquery.overlayScrollbars.min.js' | prepend: site.baseurl }}"></script>
 <script src="{{ '/assets/js/adminlte.min.js' | prepend: site.baseurl }}"></script>
+<script>
+  var toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
+  var currentTheme = localStorage.getItem('theme');
+  var mainHeader = document.querySelector('.main-header');
+
+  if (currentTheme) {
+    if (currentTheme === 'dark') {
+      if (!document.body.classList.contains('dark-mode')) {
+        document.body.classList.add("dark-mode");
+      }
+      if (mainHeader.classList.contains('navbar-light')) {
+        mainHeader.classList.add('navbar-dark');
+        mainHeader.classList.remove('navbar-light');
+      }
+      toggleSwitch.checked = true;
+    }
+  }
+
+  function switchTheme(e) {
+    if (e.target.checked) {
+      if (!document.body.classList.contains('dark-mode')) {
+        document.body.classList.add("dark-mode");
+      }
+      if (mainHeader.classList.contains('navbar-light')) {
+        mainHeader.classList.add('navbar-dark');
+        mainHeader.classList.remove('navbar-light');
+      }
+      localStorage.setItem('theme', 'dark');
+    } else {
+      if (document.body.classList.contains('dark-mode')) {
+        document.body.classList.remove("dark-mode");
+      }
+      if (mainHeader.classList.contains('navbar-dark')) {
+        mainHeader.classList.add('navbar-light');
+        mainHeader.classList.remove('navbar-dark');
+      }
+      localStorage.setItem('theme', 'light');
+    }
+  }
+
+  toggleSwitch.addEventListener('change', switchTheme, false);
+</script>

docs/_includes/navbar.html

@@ -1,4 +1,4 @@
-<nav class="main-header navbar navbar-expand navbar-white navbar-light">
+<nav class="main-header navbar navbar-expand navbar-light">
   <ul class="navbar-nav">
     <li class="nav-item">
       <a class="nav-link" data-widget="pushmenu" href="#"><i class="fa fa-bars"></i></a>
@@ -21,6 +21,17 @@
     <!-- <li class="nav-item d-none d-sm-inline-block">
       <a href="index3.html" class="nav-link">Home</a>
     </li> -->
+    <li class="nav-item">
+      <div class="theme-switch-wrapper nav-link">
+        <label class="theme-switch" for="checkbox">
+          <input type="checkbox" id="checkbox" />
+          <span class="slider round"></span>
+        </label>
+      </div>
+    </li>
+    <!-- <li class="nav-item">
+      <em class="nav-link">Enable Dark Mode!</em>
+    </li> -->
   </ul>
 
   <!-- SEARCH FORM -->

docs/assets/css/docs.css

@@ -1,3 +1,52 @@
 .max-height-300 pre {
-  max-height: 300px
+  max-height: 300px;
+}
+
+.theme-switch {
+  display: inline-block;
+  height: 24px;
+  position: relative;
+  width: 50px;
+}
+
+.theme-switch input {
+  display: none;
+}
+
+.slider {
+  background-color: #ccc;
+  bottom: 0;
+  cursor: pointer;
+  left: 0;
+  position: absolute;
+  right: 0;
+  top: 0;
+  transition: 400ms;
+}
+
+.slider::before {
+  background-color: #fff;
+  bottom: 4px;
+  content: "";
+  height: 16px;
+  left: 4px;
+  position: absolute;
+  transition: 400ms;
+  width: 16px;
+}
+
+input:checked + .slider {
+  background-color: #66bb6a;
+}
+
+input:checked + .slider::before {
+  transform: translateX(26px);
+}
+
+.slider.round {
+  border-radius: 34px;
+}
+
+.slider.round::before {
+  border-radius: 50%;
 }